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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6ff602bc1747390a4615732118d1741cc88bf455d087187fb6a7bbf98e7e92' 
  AND token = 'kQvfOeq1Vqkw1ZUcD3l5LyBU12xldpgN8RR+cAsLXqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}